Exerciser

ABSTRACT

An exerciser has a frame, a driving assembly, a damping assembly, and a linkage assembly. The frame has a base and a rear supporting rod. The driving assembly is mounted on the frame and has two swinging rods, two sprockets, two chains, and two resilient members. The swinging rods are connected to the rear supporting rod. The two sprockets are mounted rotatably on the rear supporting rod. The two chains are respectively engaged with the two sprockets. The two resilient members are connected respectively to the chains. The damping assembly is mounted on the rear supporting rod and is connected to the driving assembly to provide a damping effect to the two sprockets. The linkage assembly is connected between the base of the frame and the two swinging rods to allow the two swinging rod to respectively swing in reverse directions.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates to an exerciser, and more particularly to an exerciser for training strength and power of muscles of legs for sprint.

2. Description of Related Art

Indoor exercisers can solve weather and location issues for exercising. The conventional exerciser for training muscles of legs, such as treadmills or steppers, can also burn calories and train vital capacity of a user. However, the conventional exercisers cannot train strength and power of specific muscles of legs of an athlete for sprint.

To overcome the shortcomings, the present invention tends to provide an exerciser to mitigate or obviate the aforementioned problems.

SUMMARY OF THE INVENTION

The main objective of the invention is to provide an exerciser for training strength and power of muscles of legs for sprint.

The exerciser has a frame, a driving assembly, a damping assembly, and a linkage assembly. The frame has a base, a front supporting rod, and a rear supporting rod, and a grip assembly. The front supporting rod is mounted on a front end of the base. The rear supporting rod is mounted on the base. The grip assembly is mounted on the front supporting rod. The driving assembly is mounted on the frame and has two swinging rods, two pedals, two sprockets, two chains, and two resilient members. The two swinging rods are connected swingably to two sides of the rear supporting rod respectively. The two pedals are mounted respectively on the two swinging rods. The two sprockets are mounted rotatably on the two sides of the rear supporting rod respectively. The two chains are respectively mounted around and engaged with the two sprockets. Each chain has a first end connected to one of the swinging rods to allow the sprockets to be rotated via the transmission of the chains while the swinging rods being swinging and a second end. The two resilient members are connected respectively to the chains, and each resilient member has two ends connected respectively to the second end of a corresponding one of the chains and the base of the frame. The damping assembly is mounted on the rear supporting rod and is connected to the driving assembly to provide a damping effect to the two sprockets. The linkage assembly is connected between the base of the frame and the two swinging rods to allow the two swinging rod to respectively swing in reverse directions.

Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an exerciser in accordance with the present invention;

FIG. 2 is another perspective view of the exerciser in FIG. 1 ;

FIG. 3 is a side view of the exerciser in FIG. 1 ;

FIG. 4 is an enlarged side view of a damping assembly of the exerciser in FIG. 1 ;

FIG. 5 is another enlarged side view of damping assembly of the exerciser in FIG. 1 ;

FIG. 6 is an enlarged side view of a linkage assembly of the exerciser in FIG. 1 ; and

FIG. 7 is another enlarged side view of the linkage assembly of the exerciser in FIG. 1 .

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT

With reference to FIGS. 1 to 7 , an exerciser in accordance with the present invention comprises a frame 10, a driving assembly 20, a damping assembly 30, and a linkage assembly 40.

The frame comprises a base 11, a front supporting rod 12, and a rear supporting rod 13. The front supporting rod 12 is mounted on a front end of the base 11. A grip assembly 120 is mounted on the front supporting rod 12 to allow a user to hold the grip assembly 120 while using the exerciser. The rear supporting rod 13 is mounted on the base 11. A seat 130 is mounted on a top of the rear supporting rod 13 to allow the user to sit on the seat 130. A damping controller 121 is mounted on the front supporting rod 12 to allow the user to control and switch the damping effect provided by the damping assembly 30.

The driving assembly 20 is mounted on the frame 10 and comprises two swinging rods 21, two pedals 22, two sprockets 23, two chains 24, two resilient members 25, and two blocks 27. The two swinging rods 21 are connected swingably to two sides of the rear supporting rod 13 respectively. The two pedals 22 are rotatably mounted respectively on ends of the two swinging rods 21. The two sprockets 23 are mounted rotatably on the two sides of the rear supporting rod 13 respectively. The two chains 24 are respectively mounted around and engaged with the two sprockets 23. Each chain 24 has a first end and a second end. The first end of each chain 24 is connected to one of the swinging rods 21 to allow the sprockets 23 to be rotated via the transmission of the chains 24 while the swinging rods 21 being swinging. The two resilient members 25 are connected respectively to the chains 24. Each resilient member 24 is preferable a spring and has two ends connected respectively to the second end of a corresponding one of the chains 24 and the base 11. Accordingly, the resilient members 25 can provide resilience forces to the chains 24. In addition, the driving assembly 20 may further comprise two guiding wheels 26 mounted rotatably on the two swinging rods 21 respectively and engaged respectively with the chains 24 to limit expansion directions of the resilient members 25. The two blocks 27 are mounted respectively on the two sides of the rear supporting rod 13 to selectively abut against the two swinging rods 21 respectively, such that the swinging ranges of the swinging rods 21 can be limited by the blocks 27.

The damping assembly 30 is mounted on the rear supporting rod 13 and is connected to the driving assembly 20 to provide a damping effect to the two sprockets 21. The damping assembly 30 comprises a first pulley 31, a second pulley 32, a damping pulley 33, and two belts 34. The first pulley 31 is mounted rotatably on the rear supporting rod 13 and is co-axial with and driven by the two sprockets 23 to be rotated in unidirectional by the sprockets 23. The second pulley 32 is mounted rotatably on the rear supporting rod 13 and is located under the first pulley 31. A first transmission wheel 320 is mounted co-axially with and on a side of the second pulley 32. The damping pulley 33 is mounted rotatably on the rear supporting rod 13 and is located under the second pulley 32. The damping pulley 33 may be a magnetic damping wheel and is connected electrically to the damping controller 121, such that the damping controller 21 can control and switch the magnetic force generated by the damping pulley 33 to allow the damping pulley 33 to provide a damping force. The belts 24 include a first belt and a second belt. The first belt is mounted around the first pulley 31 and the first transmission wheel 320, and the second belt is mounted around the second pulley 32 and the second transmission wheel 330. Furthermore, the damping assembly 30 may further comprise two tension wheels 35. The two tension wheels 35 abut respectively against the first and second belts 34. Two arms 350 are connected to the rear supporting rod 13, and the two tension wheels 35 are mounted respectively on the two arms 350. Two resilient elements 351 are connected respectively to the arms 350 to provide a force to the tension wheels 35 for abutting against the first and second belts 34. Each resilient element 351 may be a spring.

The linkage assembly 40 is connected between the base 11 and the two swinging rods 21 to allow the two swinging rod 21 to respectively swing in reverse directions. The linkage assembly 40 comprises two pivotal arms 41, a connection member 42, and two levers 43. One end of each pivotal arm 41 is connected pivotally to the base 11. The connection member 42 is connected to the pivotal arms 41 to allow that while one of the pivotal arms 41 is pivoted upward, and the other pivotal arm 41 is pivoted downward. Each lever 43 has a top end connected pivotally to one of the two swinging rod 21 and a bottom end connected pivotally to an end of a corresponding one of the two pivotal arms 41. Accordingly, the two pivotal arms 41 can be pivoted by the levers 43.

With such an exerciser, a user can hold the grip assembly 120 and steps on the pedals 22 to form a posture for sprint. The user can steps the pedals 22 alternately to swing the swinging rods 21 upward and downward, such that the damping pulley 33 can be rotated by the transmission of the two sprockets 24 and the damping assembly 30. With the damping force provided by the damping pulley 33, the strength and power of the muscles of the legs of the user can be effectively trained. In addition, the user can sit on the seat 130 for rest.

Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed. 

What is claimed is:
 1. An exerciser comprising: a frame having a base; a front supporting rod mounted on a front end of the base; a rear supporting rod mounted on the base; and a grip assembly mounted on the front supporting rod; a driving assembly mounted on the frame and comprising two swinging rods connected swingably to two sides of the rear supporting rod respectively; two pedals mounted respectively on the two swinging rods; two sprockets mounted rotatably on the two sides of the rear supporting rod respectively; two chains respectively mounted around and engaged with the two sprockets, and each chain having a first end connected to one of the swinging rods to allow the sprockets to be rotated via the transmission of the chains while the swinging rods being swinging and a second end; and two resilient members connected respectively to the chains, and each resilient member having two ends connected respectively to the second end of a corresponding one of the chains and the base of the frame; a damping assembly mounted on the rear supporting rod and connected to the driving assembly to provide a damping effect to the two sprockets; and a linkage assembly connected between the base of the frame and the two swinging rods to allow the two swinging rod to respectively swing in reverse directions.
 2. The exerciser as claimed in claim 1, wherein the frame further comprises a seat mounted on a top of the rear supporting rod.
 3. The exerciser as claimed in claim 1, wherein the frame further comprises a damping controller mounted on the front supporting rod.
 4. The exerciser as claimed in claim 1, wherein the two resilient members are springs.
 5. The exerciser as claimed in claim 1, wherein the driving assembly further comprises two guiding wheels mounted rotatably on the two swinging rods respectively and engaged respectively with the chains to limit expansion directions of the resilient members.
 6. The exerciser as claimed in claim 3, wherein the damping assembly comprises a first pulley mounted rotatably on the rear supporting rod and being co-axial with and driven by the two sprockets to be rotated in unidirectional by the sprockets; a second pulley mounted rotatably on the rear supporting rod and being located under the first pulley; a first transmission wheel mounted co-axially with the second pulley; a damping pulley mounted rotatably on the rear supporting rod and being located under the second pulley; a second transmission wheel mounted co-axially with the damping pulley; a first belt mounted around the first pulley and the first transmission wheel; and a second belt mounted around the second pulley and the second transmission wheel.
 7. The exerciser as claimed in claim 6, wherein the damping assembly further comprises two tension wheels abutting respectively against the first and second belts; two arms connected to the rear supporting rod, wherein the two tension wheels are mounted respectively on the two aims; and two resilient elements connected respectively to the arms to provide a force to the tension wheels for abutting against the first and second belts.
 8. The exerciser as claimed in claim 1, wherein the linkage assembly comprises two pivotal arms connected pivotally to the base of the frame; a connection member connected to the pivotal arms to allow that while one of the pivotal arms is pivoted upward, and the other pivotal arm is pivoted downward; two levers, each having a top end connected pivotally to one of the two swinging rod and a bottom end connected pivotally to a corresponding one of the two pivotal arms.
 9. The exerciser as claimed in claim 1, wherein the driving assembly further comprises two blocks mounted respectively on the two sides of the rear supporting rod to selectively abut against the two swinging rods respectively. 